Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 285 for “"Veins"”.
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The veins of Chanarcillo, Chile
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1918.
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Hypoxia-induced responses of porcine pulmonary veins.
The pulmonary vein (PV) constricts to hypoxia however little is known about the underlying mechanisms. Hypoxic PV constriction is proposed to recruit upstream capillary beds and optimise gas exchange in healthy humans and may play a role in high altitude pulmonary oedema. The PV is also intrinsic …
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The manganese veins at West Cummington, Massachusetts
Thesis: B.S., Massachusetts Institute of Technology, Department of Geology, 1933
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Cellular mechanisms of acute hypoxic pulmonary vasoconstriction in intrapulmonary veins.
… (HPV) involves both pulmonary arteries and veins, but little is known of the contractile mechanisms specific to the veins. The aim of these studies was to examine the hypoxic response in small porcine intrapulmonary veins in relation to the arterial response, and investigate the effects of …
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Optimising outcomes in the treatment of lower limb varicose veins
Varicose veins are dilated and tortuous subcutaneous veins, which affect a significant proportion of adults. They cause physical and emotional symptoms, and affect quality of life in sufferers. The management of varicose veins has evolved since the early 20th century, when Babcock described what …
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Characterization of pentlandite-bearing quartz veins of Kambalda, Western Australia
… of various types of cross-cutting quartz veins that have not yet been fully described and classified. During recent mining activities at the eastern flank of the Kambalda Dome, three types of quartz veins have been observed: barren quartz veins, auriferous quartz veins and …
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Aspects of deformation in a fold-thrust belt: veins and backstop evolution
… two specific aspects of fold-thrust belts: the veins that develop within them and the evolution of the backstop. Veins are mineral aggregates that precipitate in fractures and a backstop is the rigid body that defines the hinterland-most extent of the fold-thrust belt. Analysis of veins can …
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Geochemical records in travertine veins at the Green River CO2 seeps (Utah)
… form along both faults. Fossil travertine veins can be dated by U-Th chronology and preserve chemical signatures of the fluids they form from: trace metals, δ234Ui and 87Sr/86Sr. Laser ablation methods were developed to analyse these samples, allowing for rapid, high spatial resolution …
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Content and solubility of trace element in veins quartz from Ouachita Mountain, Arkansas.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. M.S.
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HYDROTHERMAL FLUID TRANSPORT PATHWAYS ALONG FRACTURES AND VEINS AT BROTHERS VOLCANO, SOUTHERN KERMADEC ARC
<p>Hydrothermal fluid flow in fractures and veins is a key component in the mineralization of economic metals within calderas. But there are several methods by which fractures can form. Regional extension, episodic caldera collapse, and fluid overpressure all have the potential to create brittle …
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Depth and Size Limits for the Visibility of Veins Using the VeinViewer Imaging System
… the nurse or the phlebotomist to access the veins in patients at hospitals or phlebotomy centers. It is important to minimize the discomfort associated with sticking needles in the patient more than once and most often, necessary to find an appropriate vein within few minutes. However, …
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Do Butterflies Use "Hearing Aids"?Investigating the Structure and Function of Inflated Wing Veins in Nymphalidae
… on the function and evolution of these inflated veins. A laser vibrometry study showed that ears in the common wood nymph, Cercyonis pegala, are tuned to sounds between 1-5 kHz and the inflated subcostal vein enhances sensitivity to these sounds. A comparative study showed that all species with …
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Mineral, fluid and thermal evolution in veins from late orogenic coal basins of the Cantabrian Zone (Variscan, NW Spain)
The detailed study of syn-tectonic mineral veins and textural features of fluid inclusions is a useful approach for reconstructing the fluid and thermal evolution in diagenetic and very low-grade metamorphism environments. Here, mineralised fissures within the clastic sedimentary rocks of the …
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Mineralization and Wall Rock Alteration Flin Flon area, Saskatchewan
… The gold deposits occur in gold-quartz-sulphide veins. These veins have been classed as: (1) gold-quartz veins, (2) quartz-sulphide-carbonate veins, (3) quartz-sulphide veins, and (4) quartz-arsenopyrite veins. One copper deposit was studied and it was classed as a sulphide replacement deposit. …
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Gold-quartz vein mineralization in Stanly County, North Carolina
… were first found in 1799. Gold-bearing quartz veins, typical of those found in many parts of the Appalachians, have been studied at the Cotton Patch, Mountain Creek, Parker, Gold Hill, and Coggins mines. The veins are sharply defined, near-vertical, and lie subparallel to schistosity in the …
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Geology of the Snip Mine, and its relationship to the magmatic and deformational history of the Johnny Mountain area, northwestern British Columbia
… the Twin zone, is the largest of numerous shear veins in the mine workings. It contains just under 30 tonnes of gold. The Twin zone is composed of four ore types that are mineralogical end members of two distinctive styles of mineralisation. They are: (i) carbonate and (ii) chlorite-biotite ore …
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Long-term patency of nitinol stent placement in dysfunctional hemodialysis
… Results: The stents were placed in 26 central veins (31.3%), 40 upper arm veins (48.2%), 11 cubital veins (13.3%), and 6 forearm veins (7.2%) with 100% technical and clinical success rates. The 3months, 6months, 1-, 2-, 3-, and 4-year primary patency rates were 81%, 66.7%, 43.1%, 28.8%, 25.2%, …
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